KTM 620 Duke
KTM Duke 620 | |
Manufacturer | |
---|---|
Also called | GS620 Duke, GS 620 Duke, 620 Duke |
Production | 1995 - 96 |
Engine | Four stroke, single cylinder, SOHC, 4 valves |
Compression ratio | 10.4:1 |
Top Speed | 169 km/h / 105 mph |
Ignition | KDC-CDI |
Transmission | 5 Speed |
Suspension | Front: White Power 4054 Top Adjuster Rear: White Power monoshock 4681 BAVP Single Adjuster |
Brakes | Front: Single 320 mm disc, 4 piston caliper Rear: Single 220 mm disc, 1 piston caliper |
Front Tire | 120/70 - 17 Pirelli MT60 |
Rear Tire | 160/60-17 Pirelli MT60 |
Seat Height | 894 mm / 35.2 in |
Weight | 145 kg / 320 lbs (dry), |
Fuel Capacity | 10.3 Liters / 2.7 US gal / 2.3 Imp gal |
Manuals | Service Manual |
It could reach a top speed of 169 km/h / 105 mph.
Engine
The engine was a Liquid cooled cooled Four stroke, single cylinder, SOHC, 4 valves. The engine featured a 10.4:1 compression ratio.
Chassis
It came with a 120/70 - 17 Pirelli MT60 front tire and a 160/60-17 Pirelli MT60 rear tire. Stopping was achieved via Single 320 mm disc, 4 piston caliper in the front and a Single 220 mm disc, 1 piston caliper in the rear. The front suspension was a White Power 4054 Top Adjuster while the rear was equipped with a White Power monoshock 4681 BAVP Single Adjuster. The 620 Duke was fitted with a 10.3 Liters / 2.7 US gal / 2.3 Imp gal fuel tank. The bike weighed just 145 kg / 320 lbs.
Photos
Overview
KTM 620 Duke
D0 NOT BUY THIS MOTORCYCLE. DON'T EVEN THINK
ABOUT IT.
Steer clear. Move on before it's too late. Turn the page. Nothing good can
come of it. KTM's Duke, the first pure streetbike the tiny Austrian firm has
sold in the U.S., is a diabolic device that will land you in hot water quicker
than Senator Bob PackWood at a panty raid. This bike is 609cc worth of stonkin'
Single that lives for three things and three things only: 1) wheelies, 2)
stoppies and 3) rorty romps through the gearbox. The meek may inherit the Earth,
but they won't be riding around on KTM Dukes.
You can thank ABC Sports for the Duke. It's a direct descendent of the hybrid
racebikes used in the early-'80s made-for-TV "Superbikers" shows. Run on a
half-dirt, half-asphalt course, these were mainly big-bore two-stroke
motocrossers with shortened suspensions, roadracing front brakes and tlat-track
tires. Several years after the show went off the air, Superbikers racing was
rediscovered by the Europeans-in particular the French, apparently unsatiated by
old Jerry Lewis movies and "Baywatch" renins, and casting about for another
American art form to adopt. "Supermotard" was born, soon to grow into a series
with a season-ending finale that now attracts big-name racers from all over the
world
All of this did not go unnoticed by KTM back home in Mattighofen at the foot
of the Bavarian Alps. When the European show circuit rolled around in 1993,
there on the KTM Sportmotorcycle AG stand, among the MXers and the enduros, was
a curious-looking concept bike with supermotard styling. Reaction from the press
and public was so strong that KTM put the bike on the books for 1994; now a
limited number of Dukes have been brought to the U.S.
Not much has changed from that 1993 concept bike. The Duke's chassis is based
heavily on the company's off-road frame, gussied up with a polished aluminum
swingarm. The fuel tank is the same 3-gal-lon vessel used on the dirtbikes,
molded in black plastic this time. Sheathing the sides of the tank and sweeping
forward around the twin radiators are plastic shrouds finished in a very tasty
gray-on-black checkerboard pattern meant to resemble carbon-fiber. Sidepanels
and rear lender were also pulled from the dirtbike molds, set off by dark
metallic-gray paint and more faux-fiber. A graceful pair of passenger grabrails
bolts to the rear fender, and a nicely done subfender/chain-guard mates to the
swingarm.
Leading this assemblage down the road is the Duke's most radical derivation
from its dirtbike roots. The Dutch-made 40mm WP Roma fork is roadrace-quality
stuff, mated to a similarly serious Brembo four-piston caliper. The latter,
plumbed with a plastic-wrapped steel line, is capable of brutally severe
stoppage-witness coverboy D. Canet standing the Duke on its nose like a trained
circus seal.
Topping the whole affair is an organically styled fairing that incorporates
twin headlights, tachometer, speedometer, ignition switch/fork lock and a small
cluster of warning lights. The speedo and tach faces are particularly
touchy-feely, with numbers done in a lilting, script type-style. Also, the tach
doesn't read in anything as clinical as rpm; it records "beats per minute."
Disregard the bold "620cc" emblazoned on the fairing's sides, by the way,
truth-in-labeling being a somewhat loose concept in Austria-the Duke's 101 x
76mm bore and stroke works out to an actual 609cc.
Akront supplies the Duke's jaunty wire-spoked rims, 17-inchers, wide
enough-at 3.5 inches front, 4.5 rear-to qualify for sportbike duty. Spooned onto
these are limited-production Pirelli MT60 radials that, true to the supermotard
theme, resemble dirt-track tires. These proved surprisingly grippy, the downside
being accelerated wear, especially at the rear, and the fact that the MTs will
most likely need to be special-ordered come replacement time.
The end result of all this cross-bred styling is a motorcycle with an
undeniable flair-part dirt-slinger, part roadster, with a touch of Bat-bike
thrown in for good measure, all put together with a level of fit-and-finish that
rivals anything being built today.
That degree of refinement does not, however, extend to the Duke's engine. It
was built for enduro and motocross competition, so it's fairly uncivilized for a
street motor, which gives the bike a certain hooligan charm, but doesn't make it
very suitable for around-town plonking or steady-state highway cruising. The
Duke is happiest when it's pulling hard through its slick-shifting five-speed
gearbox, revs zinging between 5000 and 8000 rpm (redline is 8500), cutting loose
with the splendid sound that only a lightly muffled, high-.revving Single can
generate-think of a BSA Gold Star on crystal-meth.
Fair enough; KTM makes no pretense that the Duke is anything other than "an
unashamed street fighter...not for sissies...designed for the experienced
enthusiast...built with true connoisseurs in mind," to quote the company
literature.
In KTM's view, electric start has no place on such a he-man's machine, so the
Duke has to be kicked to life. The good news is that the LC4 motor is one of the
easiest-starting big-bore Singles ever. Retract the sidestand, making sure the
double-spring-loaded apparatus-mandated by some well-meaning Euro-crat, no
doubt-doesn't thwack you in the shin and draw blood. Swing the left-side kick
lever out. Then, standing off to the side of the bike, kick with your right
boot. Aided by an automatic compression release, the engine will almost always
light off on the first or second kick-unless, of course, friends and family have
gathered 'round to admire your vaunted kick-starting prowess, in which case all
hope is lost....
CW s test Duke, the first California-spec model, had its 49-state Dell'Orto carb yanked in favor of a cleaner-running 38mm Edelbrock Qwik Silver II mixer. A derivative of the old Lectron carb, this uses a flat slide and a single needle-no jets. Officials of both companies admit that the Qwik Silver underwent-let's be kind here-an accelerated development program for use on the KTM. As such, the Duke's carburetion was less than ideal, with a hiccup or two in the powerband and the occasional dreaded flame-out at stoplights. Apparently, the hot tip is to fit a 40mm Qwik Silver, but don't let the California Air Resources Board know where ya heard that. Other than the carb niggles, the Duke worked as anticipated, sling-shotting around corners and annihilating apexes the way any all-up fully gassed 340-pound street-tracker with near-limitless Ground Clearance should. If the KTM pays any penalties for its dirtbike upbringing, it's in a relatively high center of gravity; two byproducts of this being a seat height of 35 inches and a slight reluctance to be slammed hard-left, hard-right (or vice versa) during on-the-limit cornering. KTM will import 80 Duke 620s this year, priced at a super-stiff $7900. It's a motorcycle for people who understand the allure of a performance Single, who like to be different, who want a bike with balls. And if you hurry, there might just be a few left that are unspoken for. But, remember, we warned you.
Source Cycle World 1995
Make Model | KTM 620 Duke |
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Year | 1995 - 96 |
Engine Type | Four stroke, single cylinder, SOHC, 4 valves |
Displacement | 609 cc / 37.2 cu in |
Bore X Stroke | 101 x 76 mm |
Compression | 10.4:1 |
Cooling System | Liquid cooled |
Induction | Dell'Orto PHM 40 SD carburetor |
Ignition | KDC-CDI |
Starting | Kick |
Max Power | 40.1 kW / 55 hp @ 7000 rpm |
Max Torque | 60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5500 rpm |
Transmission | 5 Speed |
Final Drive | Chain |
Front Suspension | White Power 4054 Top Adjuster |
Front Wheel Travel | 142 mm / 5.6 in |
Rear Suspension | White Power monoshock 4681 BAVP Single Adjuster |
Rear Wheel Travel | 170 mm / 6.7 in |
Front Brakes | Single 320 mm disc, 4 piston caliper |
Rear Brakes | Single 220 mm disc, 1 piston caliper |
Front Wheel | 3.50 x 17, wire spoked |
Rear Wheel | 4.50 x 17, wire spoked |
Front Tire | 120/70 - 17 Pirelli MT60 |
Rear Tire | 160/60-17 Pirelli MT60 |
Seat Height | 894 mm / 35.2 in |
Dry Weight | 145 kg / 320 lbs |
Fuel Capacity | 10.3 Liters / 2.7 US gal / 2.3 Imp gal |
Fuel Reserve | 1.8 L / 1.9 US qt / 1.6 Imp qt |
Consumption Average | 6.4 L/100 km / 15.7 km/l / 37 US mpg / 44.4 Imp mpg |
Braking 100 Km/h - 0 | 36 m / 118 ft |
Standing ¼ Mile | 13.1 sec / 156 km/h / 97 mph |
Top Speed | 169 km/h / 105 mph |